JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 16
·1-9
·
IF 2.8
Tong Huijuan,Wan Jiajia,Wang Sanlong,Yu Yang,Zhang Wenqing,Liu Rui,Huang Junjun
Electromagnetic shielding has becoming a priority of researches in recent years due to electromagnetic wave pollution with the rise of electromagnetic wave. However, the present silver printed composite material is costly, which would give rise to the waste of precious metal resources. A simple method involving electroless plating, which constructs the textured electromagnetic shielding material, has been proposed and demonstrated in this paper. The inner connection between the copper tube structure and the electromagnetic shielding effect is also studied. Results indicate that the metal particle/ligand structure on the woven fabric surface can be geared up for catalyzing the deposition of copper particles, which can self-assemble to form copper tubes. The copper tube has a face-centered cubic structure with a content of 45%, the electromagnetic shielding performance of the textured copper tube is 26 dB, in which the absorbed power coefficient of this structure is 0.73, the transmission is 0.003, and this material can pass 1000 times of bending tests at different angles. Therefore, electromagnetic shielding materials can be manufactured by electroless plating and applied to the production of protective clothing for pregnant women and shielding wall coverings.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 1
·150
·
IF 4.7
Xiangyu He,Jiaqi Lu,Feng Gao,Shurong Dong,Juan Li,Hao Jin,Jikui Luo
Poly(vinylidene fluoride-trifluorethylene) (P(VDF-TrFE)) has promising potential applications in radio-frequency filters due to their excellent piezoelectric properties, flexibility, and stability. In this paper, a flexible film bulk acoustic wave filter is investigated based on P(VDF-TrFE) as piezoelectric film. A new method based on three-step annealing is developed to efficiently remove the porosity inside the P(VDF-TrFE) films so as to improve its properties. The obtained film achieved high β-phase content beyond 80% and a high piezoelectric coefficient of 27.75 pm/V. Based on the low porosity β-phase films, a flexible wide-band RF filter is designed, which consists of a bulk acoustic wave resonator and lumped inductor-capacitor elements as a hybrid configuration. The resonator sets the filter’s center frequency, while the lumped LC-based matching network extends the bandwidth and enhances out-of-band rejection. The testing results of the proposed wide-band filter show its good performance, with 12.5% fractional bandwidth and an insertion loss of 3.1 dB. To verify the possibility of folding and stacking the flexible bulk acoustic wave devices for high-density multi-filter integration in MIMO communication, bending tests of the filter are also conducted with the bending strain range up to 5500 με. The testing results show no noticeable performance degradation after four bending cycles. This work demonstrates the potential of β-phase P(VDF-TrFE) bulk acoustic wave filters to expand the scope of future flexible radio-frequency filter applications.
研究领域:
材料科学
·
电子工程
·
射频技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Yun Mou,Hao Wang,Yang Peng,Jiaxin Liu,Hao Cheng,Qinglei Sun,Mingxiang Chen
Poor flexibility and high contact resistance of conductive films are primary roadblock for the incorporation of Ag flake ink into practical applications. In this work, a novel and inexpensive Ag flake/ion composite ink was prepared to directly achieve the thick conductive films with excellent performances at 100 °C. The effect of Ag ion content on the resistivity and microstructures of the modified conductive film was investigated, and the flexibility and relative resistance change of the modified conductive film were measured by the cyclic bending test and compared with the traditional Ag flake ink. Consequently, the modified conductive film sintered from Ag flake/ion-0.5 in. exhibits low electrical resistivity of 4.83 × 10 −5 Ω·cm, which is 42.9% lower than the Ag flake film sintered from the Ag flake ink, and the modified conductive film still displays smaller changes in resistivity and relative resistance after the cyclic bending tests. The enhanced conductivity and flexibility are attributed to the bridging effect of Ag nanoparticles (NPs) generated from the in–situ decomposition of Ag ion ink. These results demonstrate that the low-cost Ag flake/ion composite ink provides a tempting prospect for fabricating high-quality flexible printed electronics at low temperature.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 10
·6619-6629
·
IF 3.9
Yunsheng Da,Qiqi Qu,Ling Kong,Qiang Liu,Menghan Zhu,Yiming Du,Xingyou Tian,Yanyan Liu,Hua Wang
Next-generation wearable electromagnetic interference (EMI) materials need to be provided with oxidation resistance, lightness, and flexibility. In this study, a high-performance EMI film with synergistic enhancement of Zn2+@Ti3C2Tx MXene/cellulose nanofibers (CNF) was found. The unique Zn@Ti3C2Tx MXene/CNF heterogeneous interface facilitates the loss of interface polarization, making the total electromagnetic shielding effectiveness (EMI SET) and shielding effectiveness per unit thickness (SE/d) of the films reach 60.3 dB and 5025 dB mm−1, respectively, in the X-band at the thickness of 12 μm ± 2 μm, significantly exceeding that of other MXene-based shielding materials. In addition, the coefficient of absorption gradually increases with the increasing CNF content. Moreover, under the synergistic effect of Zn2+, the film shows excellent oxidation resistance (maintaining stable performance after 30 days), greatly exceeding the previous test cycle. Furthermore, the mechanical performance and flexibility of the film are greatly enhanced (tensile strength at 60 MPa, and maintaining stable performance after 100 times bending tests) due to the CNF and hot-pressing process. Therefore, with the enhancement of the EMI performance, high flexibility and oxidation resistance under high temperature and high humidity conditions, the as-prepared films have wide practical significance and broad application prospects in a series of complex applications, such as flexible wearable fields, ocean engineering fields and high-power device packaging fields.
研究领域:
材料科学
·
电磁干扰
·
纳米技术
·
可穿戴技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhipeng Yong,Shuang Wang,Xiaodong Wang,Geng Liu,Dan Liang,Yinghe Cui,Fengxiang Liu,Di Wang,Zhe Wang
In this study, we prepare a kind of supercapacitor (SC) through all-in-one assembled method with redox-active ionogel electrolyte and carbon paper electrodes. The ionogel is compounded with poly (vinyl alcohol) (PVA), polyacrylamide (PAAM), lithium sulfate (Li 2 SO 4 ) , and 1-butyl-3-methylimidazolium bromide ionic liquid (BMIMBr IL). The device reveals outstanding long-term stability of 99.6% percent after 5000 times charge/discharge test in high current density, which is largely owed to the all-in-one method and low loss rate of ionogel that provides confined space, stable structure and good contact between electrodes and electrolytes interfaces. Due to the existence of double cross-link structure, ionogels exhibit excellent mechanical properties, which are proved by bending tests of flexible devices. Additionally, wide potential window of 1.6 V and pseudocapacitance provided by bromide ions redox reaction (Br - /Br 3 - ) make the device have a relatively high area capacitance of 284.8 mF cm −2 in the activated carbon field. Moreover, the device also possesses a high energy density of 25.3 Wh kg −1 with the power density of 99.8 W kg −1 at 0.5 mA cm −2 current density.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）